Finding the Fourth Proportional to 22,491.59, 31,038.65 and 12,420.02

Step by Step Solution

1. Step 1: Write the proportion equation
   22,491.59 : 31,038.65 = 12,420.02 : x
2. Step 2: Convert to fraction form
   22,491.59/31,038.65 = 12,420.02/x
3. Step 3: Cross multiply
   22,491.59x = 31,038.65 × 12,420.02
4. Step 4: Simplify right side
   22,491.59x = 385,500,762.42
5. Step 5: Solve for x
   x = 385,500,762.42/22,491.59
6. Step 6: Final answer
   x = 17,139.77